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On June 5, 1888, the Montevideo journal La Tribuna Popular reported the earthquake and its effects: The houses' woodwork creaked loudly, lamps swung, furniture moved and paintings fell off walls. Glassware objects broke and porcelain could be seen jolting out of cupboards. Astonished at the strong earthquake, inhabitants have had a sleepless night...

Also, a Colonia del Sacramento local journal La Lucha reported on a particular event: The steamer 'Saturno' en route from the neighbouring country's capital (Buenos Aires) was calmly sailing in 20 feet (6 m) of water along the centre of the channel when she came to a sudden halt, as though she had run aground. The captain had soundings taken but the vessel, as if moved by some hidden force, was freed from the ground and continued on her way.

Satellite view of the estuary of the Río de la Plata. North bank:Uruguay. South bank: Argentina

Every settlement along the Río de la Plata's shore was affected, especially the cities of Buenos Aires and Montevideo. Only slight damage occurred since there were no high buildings or underground trains in those cities at the time. However, at no time since this earthquake have antiseismic building measures been taken in either of the two nations.

The panic caused by this earthquake among the inhabitants of both banks of Río de la Plata was marked, because they were unfamiliar with seismic events, as are today’s inhabitants. However, a previous event had been recorded: the 15 August 1848 earthquake which, just as that of 1888, caused no major damage and may have been seen as an isolated phenomenon or since its epicentre was faraway from the continent and thus distant from settlements, it may have been considered that future quakes would probably occur in those latitudes and cause no damage on the continent, it is worth mentioning, though, that there are no aseismic regions in the world. Such an event could therefore happen again in the River Plate as evidenced by 26 June 1988 and 10 January 1990 earthquakes, the latter being the only one registered on Uruguayan mainland territory.

These earthquakes are believed to have originated in a particular region, the Punta del Este basin, which is highly faulted and where tectonic plates might experience certain movement thus causing the earthquake waves, according to Alberto Benavídez Sosa MGEOPHYS, agronomical engineer and former president of CERESIS (Seismology Regional Centre for South America) Earthquakes in the easternmost edge of the Pacifictectonic plates can occasionally be felt in the Argentine Atlantic coast, including Buenos Aires and only rarely on the Uruguayan coast.

1.
Coordinated Universal Time
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Coordinated Universal Time, abbreviated to UTC, is the primary time standard by which the world regulates clocks and time. It is within about 1 second of mean time at 0° longitude. It is one of closely related successors to Greenwich Mean Time. For most purposes, UTC is considered interchangeable with GMT, the first Coordinated Universal Time was informally adopted on 1 January 1960. This change also adopted leap seconds to simplify future adjustments, a number of proposals have been made to replace UTC with a new system that would eliminate leap seconds, but no consensus has yet been reached. Leap seconds are inserted as necessary to keep UTC within 0.9 seconds of universal time, see the Current number of leap seconds section for the number of leap seconds inserted to date. The official abbreviation for Coordinated Universal Time is UTC and this abbreviation arose from a desire by the International Telecommunication Union and the International Astronomical Union to use the same abbreviation in all languages. English speakers originally proposed CUT, while French speakers proposed TUC, the compromise that emerged was UTC, which conforms to the pattern for the abbreviations of the variants of Universal Time. Time zones around the world are expressed using positive or negative offsets from UTC, the westernmost time zone uses UTC−12, being twelve hours behind UTC, the easternmost time zone, theoretically, uses UTC+12, being twelve hours ahead of UTC. In 1995, the nation of Kiribati moved those of its atolls in the Line Islands from UTC-10 to UTC+14 so that the country would all be on the same day. UTC is used in internet and World Wide Web standards. The Network Time Protocol, designed to synchronise the clocks of computers over the internet, computer servers, online services and other entities that rely on having a universally accepted time use UTC as it is more specific than GMT. If only limited precision is needed, clients can obtain the current UTC from a number of official internet UTC servers, for sub-microsecond precision, clients can obtain the time from satellite signals. UTC is also the standard used in aviation, e. g. for flight plans. Weather forecasts and maps all use UTC to avoid confusion about time zones, the International Space Station also uses UTC as a time standard. Amateur radio operators often schedule their radio contacts in UTC, because transmissions on some frequencies can be picked up by many time zones, UTC is also used in digital tachographs used on large goods vehicles under EU and AETR rules. UTC divides time into days, hours, minutes and seconds, days are conventionally identified using the Gregorian calendar, but Julian day numbers can also be used. Each day contains 24 hours and each hour contains 60 minutes, the number of seconds in a minute is usually 60, but with an occasional leap second, it may be 61 or 59 instead

2.
Geographic coordinate system
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A geographic coordinate system is a coordinate system used in geography that enables every location on Earth to be specified by a set of numbers, letters or symbols. The coordinates are chosen such that one of the numbers represents a vertical position. A common choice of coordinates is latitude, longitude and elevation, to specify a location on a two-dimensional map requires a map projection. The invention of a coordinate system is generally credited to Eratosthenes of Cyrene. Ptolemy credited him with the adoption of longitude and latitude. Ptolemys 2nd-century Geography used the prime meridian but measured latitude from the equator instead. Mathematical cartography resumed in Europe following Maximus Planudes recovery of Ptolemys text a little before 1300, in 1884, the United States hosted the International Meridian Conference, attended by representatives from twenty-five nations. Twenty-two of them agreed to adopt the longitude of the Royal Observatory in Greenwich, the Dominican Republic voted against the motion, while France and Brazil abstained. France adopted Greenwich Mean Time in place of local determinations by the Paris Observatory in 1911, the latitude of a point on Earths surface is the angle between the equatorial plane and the straight line that passes through that point and through the center of the Earth. Lines joining points of the same latitude trace circles on the surface of Earth called parallels, as they are parallel to the equator, the north pole is 90° N, the south pole is 90° S. The 0° parallel of latitude is designated the equator, the plane of all geographic coordinate systems. The equator divides the globe into Northern and Southern Hemispheres, the longitude of a point on Earths surface is the angle east or west of a reference meridian to another meridian that passes through that point. All meridians are halves of great ellipses, which converge at the north and south poles, the prime meridian determines the proper Eastern and Western Hemispheres, although maps often divide these hemispheres further west in order to keep the Old World on a single side. The antipodal meridian of Greenwich is both 180°W and 180°E, the combination of these two components specifies the position of any location on the surface of Earth, without consideration of altitude or depth. The grid formed by lines of latitude and longitude is known as a graticule, the origin/zero point of this system is located in the Gulf of Guinea about 625 km south of Tema, Ghana. To completely specify a location of a feature on, in, or above Earth. Earth is not a sphere, but a shape approximating a biaxial ellipsoid. It is nearly spherical, but has an equatorial bulge making the radius at the equator about 0. 3% larger than the radius measured through the poles, the shorter axis approximately coincides with the axis of rotation

3.
Intraplate earthquake
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An intraplate earthquake occurs in the interior of a tectonic plate, whereas an interplate earthquake is one that occurs at a plate boundary. Interplate earthquakes, which occur at plate boundaries, are more common, nonetheless, very large intraplate earthquakes can inflict heavy damage, particularly because such areas are not accustomed to earthquakes and buildings are usually not seismically retrofitted. The surface of the Earth is made up of seven primary and eight secondary tectonic plates, the large plates move very slowly, owing to convection currents within the mantle below the crust. Because they do not all move in the direction, plates often directly collide or move laterally along each other. Relatively few earthquakes occur in environments, most occur on faults near plate margins. By definition, intraplate earthquakes do not occur near plate boundaries, compared to earthquakes near plate boundaries, intraplate earthquakes are not well understood, and the hazards associated with them may be difficult to quantify. The Charleston quake was particularly surprising because, unlike Boston and New York, in 2001, a large intraplate earthquake devastated the region of Gujarat, India. The earthquake occurred far from any plate boundaries, which meant the region above the epicenter was unprepared for earthquakes, in particular, the Kutch district suffered tremendous damage, where the death toll was over 12,000 and the total death toll was higher than 20,000. The 1888 earthquake in Río de la Plata, Brazil, was also an intraplate quake, many cities live with the seismic risk of a rare, large intraplate earthquake. The cause of earthquakes is often uncertain. In many cases, the fault is deeply buried. Under these circumstances it is difficult to calculate the exact seismic hazard for a given city, some progress is being made in understanding the fault mechanics driving these earthquakes. Scientists continue to search for the causes of earthquakes. The best success has come with detailed micro-seismic monitoring, involving dense arrays of seismometers, in this manner, very small earthquakes associated with a causative fault can be located with great accuracy, and in most cases these line up in patterns consistent with faulting. Cryoseisms can sometimes be mistaken for intraplate earthquakes, New Madrid Seismic Zone Saint Lawrence rift system Stein, S. and S. Mazzotti. Continental Intraplate Earthquakes, Science and Policy Issues, Geological Society of America, Special Paper 425

4.
Argentina
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Argentina, officially the Argentine Republic, is a federal republic in the southern half of South America. With a mainland area of 2,780,400 km2, Argentina is the eighth-largest country in the world, the second largest in Latin America, and the largest Spanish-speaking one. The country is subdivided into provinces and one autonomous city, Buenos Aires. The provinces and the capital have their own constitutions, but exist under a federal system, Argentina claims sovereignty over part of Antarctica, the Falkland Islands, and South Georgia and the South Sandwich Islands. The earliest recorded presence in the area of modern-day Argentina dates back to the Paleolithic period. The country has its roots in Spanish colonization of the region during the 16th century, Argentina rose as the successor state of the Viceroyalty of the Río de la Plata, a Spanish overseas viceroyalty founded in 1776. The country thereafter enjoyed relative peace and stability, with waves of European immigration radically reshaping its cultural. The almost-unparalleled increase in prosperity led to Argentina becoming the seventh wealthiest developed nation in the world by the early 20th century, Argentina retains its historic status as a middle power in international affairs, and is a prominent regional power in the Southern Cone and Latin America. Argentina has the second largest economy in South America, the third-largest in Latin America and is a member of the G-15 and it is the country with the second highest Human Development Index in Latin America with a rating of very high. Because of its stability, market size and growing high-tech sector, the description of the country by the word Argentina has to be found on a Venice map in 1536. In English the name Argentina probably comes from the Spanish language, however the naming itself is not Spanish, Argentina means in Italian of silver, silver coloured, probably borrowed from the Old French adjective argentine of silver > silver coloured already mentioned in the 12th century. The French word argentine is the form of argentin and derives of argent silver with the suffix -in. The Italian naming Argentina for the country implies Argentina Terra land of silver or Argentina costa coast of silver, in Italian, the adjective or the proper noun is often used in an autonomous way as a substantive and replaces it and it is said lArgentina. The name Argentina was probably first given by the Venitian and Genoese navigators, in Spanish and Portuguese, the words for silver are respectively plata and prata and of silver is said plateado and prateado. Argentina was first associated with the silver mountains legend, widespread among the first European explorers of the La Plata Basin. The first written use of the name in Spanish can be traced to La Argentina, a 1602 poem by Martín del Barco Centenera describing the region, the 1826 constitution included the first use of the name Argentine Republic in legal documents. The name Argentine Confederation was also used and was formalized in the Argentine Constitution of 1853. In 1860 a presidential decree settled the name as Argentine Republic

5.
Uruguay
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Uruguay, officially the Oriental Republic of Uruguay, is a country in the southeastern region of South America. It borders Argentina to its west and Brazil to its north and east, with the Río de la Plata to the south and the Atlantic Ocean to the southeast. Uruguay is home to an estimated 3.42 million people, of whom 1.8 million live in the area of its capital and largest city. With an area of approximately 176,000 square kilometres, Uruguay is geographically the second-smallest nation in South America, only larger in size than Suriname. Uruguay was inhabited by the Charrúa people for approximately 4000 years before the Portuguese established Colonia del Sacramento, one of the oldest European settlements in the region, in 1680. Montevideo was founded as a stronghold by the Spanish in the early 18th century. Uruguay won its independence between 1811 and 1828, following a struggle between Spain, Portugal, Argentina and Brazil. It remained subject to influence and intervention throughout the 19th century. Modern Uruguay is a constitutional republic, with a president who serves as both head of state and head of government. Uruguay is ranked first in Latin America in democracy, peace, lack of corruption, e-government, on a per-capita basis, Uruguay contributes more troops to United Nations peace-keeping missions than any other country. It ranks second in the region on economic freedom, income equality, per-capita income, Uruguay is the third-best country on the continent in terms of HDI, GDP growth, innovation and infrastructure. It is regarded as a country by the UN. Uruguay is also the third-best ranked in the world in e-Participation, Uruguay is an important global exporter of combed wool, rice, soybeans, frozen beef, malt and milk. Nearly 95% of Uruguays electricity comes from energy, mostly hydroelectric facilities. The Economist named Uruguay country of the year in 2013, acknowledging the innovative policy of legalizing the production, sale, the name of the namesake river comes from the Spanish pronunciation of the regional Guarani word for it. There are several interpretations, including bird-river, the name could also refer to a river snail called uruguá that was plentiful in the water. The only documented inhabitants of Uruguay before European colonization of the area were the Charrúa, the Portuguese discovered the region of present-day Uruguay in 1512. The Spanish arrived in present-day Uruguay in 1516, the indigenous peoples fierce resistance to conquest, combined with the absence of gold and silver, limited their settlement in the region during the 16th and 17th centuries

6.
Richter magnitude scale
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The Richter magnitude scale assigns a magnitude number to quantify the size of an earthquake. As measured with a seismometer, an earthquake that registers 5.0 on the Richter scale has a shaking amplitude 10 times greater than an earthquake that registered 4.0 at the same distance. This means that, for instance, an earthquake of magnitude 5 releases 31.6 times as energy as an earthquake of magnitude 4. In the United States, the Richter scale was succeeded in the 1970s by the moment magnitude scale, the moment magnitude scale is now the scale used by the United States Geological Survey to estimate magnitudes for all modern large earthquakes. Richter derived his earthquake-magnitude scale from the apparent magnitude scale used to measure the brightness of stars and that fixed measure was chosen to avoid negative values for magnitude, given that the slightest earthquakes that could be recorded and located at the time were around magnitude 3.0. The Richter magnitude scale itself has no limit, and contemporary seismometers can register, record. M L was not designed to be applied to data with distances to the hypocenter of the earthquake that were greater than 600 km. Later, to express the size of earthquakes around the planet, Gutenberg and Richter developed a surface wave magnitude scale and these are types of waves that are recorded at teleseismic distances. The two scales were adjusted such that they were consistent with the M L scale and that adjustment succeeded better with the M s scale than with the M b scale. Each scale saturates when the earthquake is greater than magnitude 8.0, because of this, researchers in the 1970s developed the moment magnitude scale. The older magnitude-scales were superseded by methods for calculating the seismic moment, about the origins of the Richter magnitude scale, C. F. Richter said, I found a paper by Professor K. Wadati of Japan in which he compared large earthquakes by plotting the maximum ground motion against distance to the epicenter. I tried a similar procedure for our stations, but the range between the largest and smallest magnitudes seemed unmanageably large, dr. Beno Gutenberg then made the natural suggestion to plot the amplitudes logarithmically. I was lucky, because logarithmic plots are a device of the devil, the particular instrument used would become saturated by strong earthquakes and unable to record high values. The scale was replaced in the 1970s by the moment magnitude scale, for earthquakes adequately measured by the Richter scale, anything above 5 is classified as a risk by the USGS. Several scales have historically described as the Richter scale, especially the local magnitude M L. In addition, the body wave magnitude, m b, a couple of new techniques to measure magnitude are in the development stage by seismologists. All magnitude scales have been designed to give similar results

7.
Colonia del Sacramento
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Colonia del Sacramento is a city in southwestern Uruguay, by the Río de la Plata, facing Buenos Aires, Argentina. It is one of the oldest towns in Uruguay and capital of the Colonia Department and it has a population of around 27,000. It is renowned for its quarter, a UNESCO World Heritage Site. Modern Colonia del Sacramento produces textiles and has a trade zone, in addition to a polytechnic centre. Founded in January 1680 by Portugal as Colónia do Sacramento, the colony was disputed by the Spanish who settled on the opposite bank of the river at Buenos Aires. The colony was conquered by José de Garro in 1680, and it was conquered again by the Spanish in March 1705 after a siege of five months, but given back in the Treaty of Utrecht. Another attack during the Spanish-Portuguese War, 1735-1737, failed and it kept changing hands from crown to crown due to treaties such as the Treaty of Madrid in 1750 and the Treaty of San Ildefonso in 1777, until it remained with the Spanish. On 10 January 1809, before the independence of Uruguay, it was designated as a Villa and has since been elevated to the status of Ciudad, the rule from 1680 to present is, In 2011 Colonia del Sacramento had a population of 26,231. Source, Instituto Nacional de Estadística de Uruguay Colonia del Sacramento has a humid subtropical climate. Summers are warm and winters are cool, with frequent frosts. The precipitation is distributed throughout the year, with an average of 1,039 mm. The city was developed on a peninsula that protrudes into the Río de la Plata, the 16 hectare Barrio Histórico, or Portuguese Old City, was enclosed by a fortification wall across the peninsula in the site of present-day Calle Ituzaingó. Most of the wall was removed in 1777 and the remaining parts in 1859. The Portuguese part of the city has a street network. Outside the wall, the part of the city was planned in Spanish colonial style. The Barrio Histórico section of Colonia del Sacramento is designated a World Heritage Site by UNESCO, the historical section of Colonia, which has some cobblestone streets built by the Portuguese in the 17th century, is within walking distance of the ferry terminal. Views of the Barrio Histórico Colonia del Sacramento is served by three ferry lines from Buenos Aires, Argentina, Buquebus, Seacat Colonia and Colonia Express. There is also an airport for small planes

8.
Buenos Aires
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Buenos Aires is the capital and most populous city of Argentina. The city is located on the shore of the estuary of the Río de la Plata. The city of Buenos Aires is neither part of Buenos Aires Province nor the Provinces capital, rather, in 1880, after decades of political infighting, Buenos Aires was federalized and removed from Buenos Aires Province. The city limits were enlarged to include the towns of Belgrano and Flores, the 1994 constitutional amendment granted the city autonomy, hence its formal name, Ciudad Autónoma de Buenos Aires. Its citizens first elected a chief of government in 1996, previously, Buenos Aires is considered an alpha city by the study GaWC5. Buenos Aires quality of life was ranked 81st in the world and one of the best in Latin America in 2012 and it is the most visited city in South America, and the second-most visited city of Latin America. Buenos Aires is a top tourist destination, and is known for its preserved Spanish/European-style architecture, Buenos Aires held the 1st Pan American Games in 1951 as well as hosting two venues in the 1978 FIFA World Cup. Buenos Aires will host the 2018 Summer Youth Olympics and the 2018 G20 summit, Buenos Aires is a multicultural city, being home to multiple ethnic and religious groups. Several languages are spoken in the city in addition to Spanish, contributing to its culture, the hill was known to them as Buen Ayre, as it was free of the foul smell prevalent in the old city, which is adjacent to swampland. During the siege of Cagliari, the Aragonese built a sanctuary to the Virgin Mary on top of the hill, in 1335, King Alfonso the Gentle donated the church to the Mercedarians, who built an abbey that stands to this day. In the years after that, a story circulated, claiming that a statue of the Virgin Mary was retrieved from the sea after it miraculously helped to calm a storm in the Mediterranean Sea, the statue was placed in the abbey. Spanish sailors, especially Andalusians, venerated this image and frequently invoked the Fair Winds to aid them in their navigation, a sanctuary to the Virgin of Buen Ayre would be later erected in Seville. Pedro de Mendoza called the city Holy Mary of the Fair Winds, mendoza’s settlement soon came under attack by indigenous people, and was abandoned in 1541. For many years, the name was attributed to a Sancho del Campo, a second settlement was established in 1580 by Juan de Garay, who sailed down the Paraná River from Asunción. Garay preserved the name chosen by Mendoza, calling the city Ciudad de la Santísima Trinidad y Puerto de Santa María del Buen Aire. The short form Buenos Aires became the common usage during the 17th century, the usual abbreviation for Buenos Aires in Spanish is Bs. As. It is common as well to refer to it as B. A. or BA /ˌbiːˈeɪ/ bee-AY), while BA is used more by expats residing in the city, the locals more often use the abbreviation Baires, in one word. Seaman Juan Díaz de Solís, navigating in the name of Spain, was the first European to reach the Río de la Plata in 1516 and his expedition was cut short when he was killed during an attack by the native Charrúa tribe in what is now Uruguay

9.
Hypocentre
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A hypocenter is the point of origin of an earthquake or a subsurface nuclear explosion. It is a synonym of the focus, confusingly, the term hypocenter is also used as a synonym for ground zero, the surface point directly beneath a nuclear airburst. An earthquakes hypocenter is the position where the energy stored in the rock is first released. This occurs directly beneath the epicenter, at a known as the focal or hypocentral depth. The focal depth can be calculated from measurements based on wave phenomena. Computing the hypocenters of foreshocks, main shock, and aftershocks of earthquakes allows the three-dimensional plotting of the fault along which movement is occurring, the wave reaches each station based upon how far away it was from the hypocenter. A number of things need to be taken into account, most importantly variations in the speed based upon the materials that it is passing through. With adjustments for velocity changes, the estimate of the hypocenter is made, then a series of linear equations is set up. The equations express the difference between the arrival times and those calculated from the initial estimated hypocenter. The system iterates until the location is pinpointed within the margin of error for the velocity computations, the dictionary definition of hypocenter at Wiktionary Media related to Hypocenters at Wikimedia Commons

10.
Montevideo
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Montevideo is the capital and largest city of Uruguay. According to the 2011 census, the city proper has a population of 1,319,108 in an area of 201 square kilometres. The southernmost capital city in the Americas, Montevideo is situated in the southern coast of the country, the city was established in 1724 by a Spanish soldier, Bruno Mauricio de Zabala, as a strategic move amidst the Spanish-Portuguese dispute over the platine region. It was also under brief British rule in 1807, Montevideo hosted all the matches during the first FIFA World Cup. Montevideo is the seat of the headquarters of Mercosur and ALADI, Latin America’s leading trade blocs. Montevideo has consistently rated as having the highest quality of life of any city in Latin America. As of 2010, Montevideo was the 19th largest city economy in the continent, in 2015, it has a GDP of $40.5 billion, and a per capita of $24,400. It is classified as a Beta World City, ranking seventh in Latin America, by 2014, is also regarded as the tenth most gay-friendly city in the world, first in Latin America. It is the hub of commerce and higher education in Uruguay as well as its chief port, the city is also the financial and cultural hub of a larger metropolitan area, with a population of around 2 million. There are several explanations about the word Montevideo, all agree that Monte refers to the Cerro de Montevideo, the hill situated across the Bay of Montevideo, but there is disagreement about the etymological origin of the video part. Monte vide eu is the most widespread belief but is rejected by the majority of experts, who consider it unlikely because it involves a mix of dialects. This is the oldest Spanish document that mentions the promontory with a similar to the one that designates the city. With the passing of time, these words were unified to Montevideo, no conclusive evidence has been found to confirm this academic hypothesis nor can it be asserted with certainty which were the other five mounts observable before the Cerro. Ovidio was the bishop of the Portuguese city of Braga, where he was always revered. Between 1680 and 1683, Portugal founded the city of Colonia do Sacramento in the region across the bay from Buenos Aires and this city met with no resistance from the Spanish until 1723, when they began to place fortifications on the elevations around Montevideo Bay. On 22 November 1723, Field Marshal Manuel de Freitas da Fonseca of Portugal built the Montevieu fort, a Spanish expedition was sent from Buenos Aires, organized by the Spanish governor of that city, Bruno Mauricio de Zabala. There was also one significant early Italian resident by the name of Jorge Burgues, a census of the citys inhabitants was performed in 1724 and then a plan was drawn delineating the city and designating it as San Felipe y Santiago de Montevideo, later shortened to Montevideo. The census counted fifty families of Galician and Canary Islands origin, more than 1000 indigenous, mostly Guaraní, in 1776, Spain made Montevideo its main naval base for the South Atlantic, with authority over the Argentine coast, Fernando Po, and the Falklands

11.
Punta del Este
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Punta del Este is a city and resort on the Atlantic Coast in the Maldonado Department of southeastern Uruguay. Although the city has a population of about 9,280. Punta del Este is also the name of the municipality to which the city belongs and it includes Punta del Este proper and Península areas. The city is located on the intersection of Route 10 with Route 39, southeast of the department capital Maldonado, the first Europeans to set foot in what is now Punta del Este were the Spanish at the beginning of the 16th century. However, the colonization of the area began around Maldonado at the end of the 18th century due to Portuguese expansionism. Later the trees started to spread on their own, and now the area is full of mostly Pines, Eucalyptus, Acacias, on 5 July 1907, it was declared a Pueblo by Act of Ley 3.186. Its status was elevated to Ciudad on 2 July 1957 by the Act of Ley Nº12.397, Punta del Este hosted an American Summit in 1967 attended by U. S. President Lyndon Johnson. In September 1986, Punta del Este played host to the start of the Uruguay Round of international trade negotiations and these negotiations ultimately led to the creation of the World Trade Organization in 1994. In 2011 Punta del Este had a population of 9,277 and 23,954 households, according to the Intendencia Departamental de Maldonado, the municipality of Punta del Este has an area of 48 km2 and a population of 15,000. Source, Instituto Nacional de Estadística de Uruguay Argentines, Brazilians and Europeans are gradually choosing Punta del Este as their permanent residence, some of the reasons are peace in the midst of nature and increasing educational offerings. Punta del Este has a oceanic climate, with pleasant summers. The precipitation is distributed throughout the year, with an average of 1,010 mm. The hottest month, February, has a temperature of 21.7 °C. The average yearly temperature is 16.4 °C, Punta del Estes scenic coastline is divided in two regions, Brava and Mansa. Beaches on the Mansa side feature thick and golden sand, while on the Brava side the sand is white, every beach of the peninsula has public access. La Barra is popular for sports and fishing during the day. At later hours, La Barra becomes an attraction for the younger generation. Starting from the end of December through to the week of January

12.
Pacific Ocean
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The Pacific Ocean is the largest and deepest of the Earths oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean in the south and is bounded by Asia and Australia in the west, the Mariana Trench in the western North Pacific is the deepest point in the world, reaching a depth of 10,911 metres. Both the center of the Water Hemisphere and the Western Hemisphere are in the Pacific Ocean, the oceans current name was coined by Portuguese explorer Ferdinand Magellan during the Spanish circumnavigation of the world in 1521, as he encountered favourable winds on reaching the ocean. He called it Mar Pacífico, which in both Portuguese and Spanish means peaceful sea, important human migrations occurred in the Pacific in prehistoric times. Long-distance trade developed all along the coast from Mozambique to Japan, trade, and therefore knowledge, extended to the Indonesian islands but apparently not Australia. By at least 878 when there was a significant Islamic settlement in Canton much of trade was controlled by Arabs or Muslims. In 219 BC Xu Fu sailed out into the Pacific searching for the elixir of immortality, from 1404 to 1433 Zheng He led expeditions into the Indian Ocean. The east side of the ocean was discovered by Spanish explorer Vasco Núñez de Balboa in 1513 after his expedition crossed the Isthmus of Panama and he named it Mar del Sur because the ocean was to the south of the coast of the isthmus where he first observed the Pacific. Later, Portuguese explorer Ferdinand Magellan sailed the Pacific East to West on a Castilian expedition of world circumnavigation starting in 1519, Magellan called the ocean Pacífico because, after sailing through the stormy seas off Cape Horn, the expedition found calm waters. The ocean was often called the Sea of Magellan in his honor until the eighteenth century, sailing around and east of the Moluccas, between 1525 and 1527, Portuguese expeditions discovered the Caroline Islands, the Aru Islands, and Papua New Guinea. In 1542–43 the Portuguese also reached Japan, in 1564, five Spanish ships consisting of 379 explorers crossed the ocean from Mexico led by Miguel López de Legazpi and sailed to the Philippines and Mariana Islands. The Manila galleons operated for two and a half centuries linking Manila and Acapulco, in one of the longest trade routes in history, Spanish expeditions also discovered Tuvalu, the Marquesas, the Cook Islands, the Solomon Islands, and the Admiralty Islands in the South Pacific. In the 16th and 17th century Spain considered the Pacific Ocean a Mare clausum—a sea closed to other naval powers, as the only known entrance from the Atlantic the Strait of Magellan was at times patrolled by fleets sent to prevent entrance of non-Spanish ships. On the western end of the Pacific Ocean the Dutch threatened the Spanish Philippines, Spain also sent expeditions to the Pacific Northwest reaching Vancouver Island in southern Canada, and Alaska. The French explored and settled Polynesia, and the British made three voyages with James Cook to the South Pacific and Australia, Hawaii, and the North American Pacific Northwest, one of the earliest voyages of scientific exploration was organized by Spain in the Malaspina Expedition of 1789–1794. It sailed vast areas of the Pacific, from Cape Horn to Alaska, Guam and the Philippines, New Zealand, Australia, and the South Pacific. Growing imperialism during the 19th century resulted in the occupation of much of Oceania by other European powers, and later, Japan, in Oceania, France got a leading position as imperial power after making Tahiti and New Caledonia protectorates in 1842 and 1853 respectively. After navy visits to Easter Island in 1875 and 1887, Chilean navy officer Policarpo Toro managed to negotiate an incorporation of the island into Chile with native Rapanui in 1888, by occupying Easter Island, Chile joined the imperial nations

13.
Tectonic plates
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The theoretical model builds on the concept of continental drift developed during the first few decades of the 20th century. The geoscientific community accepted plate-tectonic theory after seafloor spreading was validated in the late 1950s, the lithosphere, which is the rigid outermost shell of a planet, is broken up into tectonic plates. The Earths lithosphere is composed of seven or eight major plates, where the plates meet, their relative motion determines the type of boundary, convergent, divergent, or transform. Earthquakes, volcanic activity, mountain-building, and oceanic trench formation occur along plate boundaries. The relative movement of the plates typically ranges from zero to 100 mm annually, tectonic plates are composed of oceanic lithosphere and thicker continental lithosphere, each topped by its own kind of crust. Along convergent boundaries, subduction carries plates into the mantle, the material lost is balanced by the formation of new crust along divergent margins by seafloor spreading. In this way, the surface of the lithosphere remains the same. This prediction of plate tectonics is also referred to as the conveyor belt principle, earlier theories, since disproven, proposed gradual shrinking or gradual expansion of the globe. Tectonic plates are able to move because the Earths lithosphere has greater strength than the underlying asthenosphere. Lateral density variations in the result in convection. Plate movement is thought to be driven by a combination of the motion of the seafloor away from the ridge and drag, with downward suction. Another explanation lies in the different forces generated by forces of the Sun. The relative importance of each of these factors and their relationship to other is unclear. The outer layers of the Earth are divided into the lithosphere and asthenosphere and this is based on differences in mechanical properties and in the method for the transfer of heat. Mechanically, the lithosphere is cooler and more rigid, while the asthenosphere is hotter, in terms of heat transfer, the lithosphere loses heat by conduction, whereas the asthenosphere also transfers heat by convection and has a nearly adiabatic temperature gradient. The key principle of plate tectonics is that the lithosphere exists as separate and distinct tectonic plates, Plate motions range up to a typical 10–40 mm/year, to about 160 mm/year. The driving mechanism behind this movement is described below, tectonic lithosphere plates consist of lithospheric mantle overlain by either or both of two types of crustal material, oceanic crust and continental crust. Average oceanic lithosphere is typically 100 km thick, its thickness is a function of its age, as passes, it conductively cools

14.
Atlantic
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The Atlantic Ocean is the second largest of the worlds oceans with a total area of about 106,460,000 square kilometres. It covers approximately 20 percent of the Earths surface and about 29 percent of its surface area. It separates the Old World from the New World, the Atlantic Ocean occupies an elongated, S-shaped basin extending longitudinally between Eurasia and Africa to the east, and the Americas to the west. The Equatorial Counter Current subdivides it into the North Atlantic Ocean, in contrast, the term Atlantic originally referred specifically to the Atlas Mountains in Morocco and the sea off the Strait of Gibraltar and the North African coast. The Greek word thalassa has been reused by scientists for the huge Panthalassa ocean that surrounded the supercontinent Pangaea hundreds of years ago. The term Aethiopian Ocean, derived from Ancient Ethiopia, was applied to the Southern Atlantic as late as the mid-19th century, many Irish or British people refer to the United States and Canada as across the pond, and vice versa. The Black Atlantic refers to the role of ocean in shaping black peoples history. Irish migration to the US is meant when the term The Green Atlantic is used, the term Red Atlantic has been used in reference to the Marxian concept of an Atlantic working class, as well as to the Atlantic experience of indigenous Americans. Correspondingly, the extent and number of oceans and seas varies, the Atlantic Ocean is bounded on the west by North and South America. It connects to the Arctic Ocean through the Denmark Strait, Greenland Sea, Norwegian Sea, to the east, the boundaries of the ocean proper are Europe, the Strait of Gibraltar and Africa. In the southeast, the Atlantic merges into the Indian Ocean, the 20° East meridian, running south from Cape Agulhas to Antarctica defines its border. In the 1953 definition it extends south to Antarctica, while in later maps it is bounded at the 60° parallel by the Southern Ocean, the Atlantic has irregular coasts indented by numerous bays, gulfs, and seas. Including these marginal seas the coast line of the Atlantic measures 111,866 km compared to 135,663 km for the Pacific. Including its marginal seas, the Atlantic covers an area of 106,460,000 km2 or 23. 5% of the ocean and has a volume of 310,410,900 km3 or 23. 3%. Excluding its marginal seas, the Atlantic covers 81,760,000 km2 and has a volume of 305,811,900 km3, the North Atlantic covers 41,490,000 km2 and the South Atlantic 40,270,000 km2. The average depth is 3,646 m and the maximum depth, the bathymetry of the Atlantic is dominated by a submarine mountain range called the Mid-Atlantic Ridge. It runs from 87°N or 300 km south of the North Pole to the subantarctic Bouvet Island at 42°S, the MAR divides the Atlantic longitudinally into two halves, in each of which a series of basins are delimited by secondary, transverse ridges. The MAR reaches above 2000 m along most of its length, the MAR is a barrier for bottom water, but at these two transform faults deep water currents can pass from one side to the other

The Río de la Plata (Spanish pronunciation: [ˈri.o ðe la ˈplata], River of Silver) — rendered River Plate in British …

NASA photo of the Río de la Plata looking from northwest to southeast. Buenos Aires is visible on the right side near the Paraná River delta. River sediments turn the water brown to the vicinity of Montevideo, visible on the left coast.

Satellite image of the Paraná and Uruguay rivers emptying into the Río de la Plata. Due to the relatively calm surface of the estuary and the angle of the Sun relative to the satellite, the current of the river flowing out into the Atlantic is visible.

The Pacific Ocean is the largest and deepest of Earth's oceanic divisions. It extends from the Arctic Ocean in the …

Universalis Cosmographia, the Waldseemüller map dated 1507, from a time when the nature of the Americas was ambiguous, particularly North America, as a possible part of Asia, was the first map to show the Americas separating two distinct oceans. South America was generally considered a "new world" and shows the name "America" for the first time, after Amerigo Vespucci

Made in 1529, the Diogo Ribeiro map was the first to show the Pacific at about its proper size